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<h2><span class="refentrytitle">Function copy_old</span></h2>
<p>boost::contract::copy_old — Query if old values need to be copied (but not for virtual public functions and public function overrides). </p>
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<h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
<div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../reference.html#header.boost.contract.old_hpp" title="Header &lt;boost/contract/old.hpp&gt;">boost/contract/old.hpp</a>&gt;

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<span class="keyword">bool</span> <span class="identifier">copy_old</span><span class="special">(</span><span class="special">)</span><span class="special">;</span></pre></div>
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<a name="idm45885983998912"></a><h2>Description</h2>
<p>For example, this function always returns false when both postconditions and exception guarantees are not being checked (see  <code class="computeroutput"><code class="computeroutput"><a class="link" href="../../BOOST_CONTRACT_NO_OLDS.html" title="Macro BOOST_CONTRACT_NO_OLDS">BOOST_CONTRACT_NO_OLDS</a></code></code>). This function is usually only called by the code expanded by  <code class="computeroutput"><code class="computeroutput"><a class="link" href="../../BOOST_CONTRACT_OLDOF.html" title="Macro BOOST_CONTRACT_OLDOF">BOOST_CONTRACT_OLDOF</a></code></code>.</p>
<p><span class="bold"><strong>See Also:</strong></span></p>
<p> <a class="link" href="../../boost_contract/extras.html#boost_contract.extras.no_macros__and_no_variadic_macros_" title="No Macros (and No Variadic Macros)"> No Macros</a></p>
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<td><p><span class="term">Returns:</span></p></td>
<td><p>True if old values need to be copied, false otherwise. </p></td>
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<td align="right"><div class="copyright-footer">Copyright © 2008-2019 Lorenzo Caminiti<p>
        Distributed under the Boost Software License, Version 1.0 (see accompanying
        file LICENSE_1_0.txt or a copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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